There are several stores where you can buy and order stickers online.

Here are two that come to mind quickly:

nostr:npub19l8kmptctt9u722lcj3cja5vcuyhakdv56ctdvdpxsnk0vfs70wsv22sz5

https://stuff4btc.de/

nostr:npub1shkq20m5h250p8xk0z9czj2eenn0agd3snarjjvaas0ltwc8pqjslcaht2

https://dezentralshop.ch/

But there are many more.